fn: add SendOrQuit

fn/send.go

@@ -0,0 +1,13 @@
+package fn
+
+// SendOrQuit attempts to and a message through channel c. If this succeeds,
+// then bool is returned. Otherwise if a quit signal is received first, then
+// false is returned.
+func SendOrQuit[T any, Q any](c chan<- T, msg T, quit chan Q) bool {
+	select {
+	case c <- msg:
+		return true
+	case <-quit:
+		return false
+	}
+}